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參數(shù)資料
| 型號： | L9705 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DOUBLE QUAD CONTACT INTERFACE CIRCUIT |
| 中文描述： | 雙四接觸界面電路 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 1861K |
| 代理商： | L9705 |
The L9705 circuit compares the input current with
the current through the internal reference resistor.
The device is designed to work with an external
input series resistor of R
IN1-8
= 1K
. With this in-
put resistor the contact current, when the contact
is closed and the device activated (EN =LOW) is:
I
IN
=
V
S
2V
1K
,for GND contacts, (1)
I
IN
=
V
BAT
+
V
BAT
2V
1K
, for V
BAT
contacts, (2)
For this calculation the limit value of the V
S
to V
IN
and V
IN
saturation voltage of 2V was considered
so that the lowest limit value of I
IN
is calculated in
(1) and (2)
Figure 4:
The output voltage as a function of the input resistance at the corresponding sense input.
The function of the circuit can be demonstrated
with the transfer characteristics, showing the out-
put status as a function of the input resistor R
I
,
shown in figure 4. The input resistor is a sum of
the R
IN
and the contact resistance R
CON
or
R
COFF
, for the closed contact:
R
I
= R
IN
+ R
CON
, (3)
and for the open contact:
R
I
= R
IN
+ R
COFF
, (4)
The output goes HIGH when the input resistance
increases above 5.3K
(GND contacts) or 6.5K
(V
BAT
contacts) and goes LOW, when the input
resistance decreases below 4K
(GND contacts)
or 4.8K
(V
BAT
contacts); these values are typical
values for the switching thresholds. The limit val-
ues of R
I
= 1.8K
(GND contacts) and R
I
=
1.8K
(V
BAT
contacts) for LOW and R
I
= 20K
(GND contacts) and 29K
(V
BAT
contacts) for
HIGH implies that a contact with R
CON
= 100
( at
I
IN
= 10mA) will be recognized as ON = LOW and
a contact with R
COFF
= 19K
(GND contacts) or
28K
(V
BAT
contact) will be recognized as OFF =
HIGH.
These limits are valid within the supply voltage
range 6V < V
S
< 16V, the ground potential differ-
ence of
V
GND
= 0.1V
S
, the battery voltage poten-
tial difference of
V
BAT
< 0.1V
BAT
and the vari-
ation of the reverse battery protection diode D1
voltage from 0.5V to 1V.
The internal clamping diodes at the contact moni-
toring inputs together with the external contacts
series resistors R
IN
allows to withstand the tran-
sients at the contact connection.The contact se-
ries resistor R
IN
limits the input current at the tran-
sient.
The dynamic behaviour of the circuit is defined
with the times t
do
and t
dTS
. When the contact is
open, the input capacitor C
IN
must be charged
through the resistor R
IN
. In this case the total de-
lay time t
do
may be influenced also with the time
constant R
IN
C
IN
.
The delay time t
dTS
, when disabling the device, is
defined only with the internal circuitry. In both
cases, output external capacitance less than
50pF is assumed, the internal output capacitance
of the tristate buffers are less than 5pF.
L9705
5/8
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| L9708 | 功能描述:低壓差穩(wěn)壓器 - LDO Quad Squib Driver PTS SmartPower RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L970813TR | 功能描述:低壓差穩(wěn)壓器 - LDO Quad Squib Driver PTS SmartPower RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L9709 | 功能描述:低壓差穩(wěn)壓器 - LDO Quad Squib Driver PTS SmartPower RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L9709TR | 功能描述:低壓差穩(wěn)壓器 - LDO Quad Squib Driver PTS SmartPower RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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